%0 Journal Article %A Maloney, John P. %T A non graph theory approach to Ulam's conjecture %J Portugaliae mathematica %D 1977 %P 1-6 %V 36 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115295/ %G en %F PORMA_1977__36_1_115295